Abstract:
BACKGROUND:Neurokinin 1 receptors (NK-1R) have been involved in several psychiatric disorders including major depression, but less is known for bipolar disorder (BD). METHOD:We compared NK-1R expression and Substance P (SP) ability to induce NF-κB activation in monocytes from BD patients and healthy donors (HD), also looking for the effects of tobacco smoke. After informed written consent, 20 euthymic BD patients, either bipolar type 1 (BDI) or type 2 (BDII), and 14 age-matched healthy donors (HD) were enrolled. NK-1R expression in monocytes was evaluated by Western blot and expressed as the ratio between NK-1R and Na(+)/K(+)-ATPase protein expressions. NF-κB activation was assessed by measuring the nuclear content of the p50 subunit (ELISA kit). RESULTS:NK-1R expression was significantly reduced (P<0.001) in monocytes from BD patients as compared to HD, with no major differences between BDI and BDII patients. Tobacco smoke enhanced NK-1R expression in HD, but not in BD patients. Un-stimulated monocytes from BD patients presented a constitutively higher (P<0.05) content of nuclear p50 subunit as compared to HD. SP and an NK-1R agonist induced NF-κB activation, with a higher effect in HD: this effect was receptor-mediated as it was abrogated by an NK-1R antagonist. LIMITATIONS:As a pilot study enrolling 20 BD patients, an obvious limitation is the sample size. CONCLUSIONS:Our results show the existence of a relevant alteration in NK-1R expression in BD patients and further suggest SP involvement in BD, so improving our understanding of the underlying mechanisms of this disease.
journal_name
J Affect Disordjournal_title
Journal of affective disordersauthors
Amoruso A,Bardelli C,Cattaneo CI,Fresu LG,Manzetti E,Brunelleschi Sdoi
10.1016/j.jad.2015.03.013subject
Has Abstractpub_date
2015-06-01 00:00:00pages
188-92eissn
0165-0327issn
1573-2517pii
S0165-0327(15)00142-1journal_volume
178pub_type
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